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WSR-88D 3-Hour Precipitation Estimate Image The WSR-88D produces 1-hour, 3-hour, and storm-total precipitation estimates. Although limitations exist, the overall estimates usually are good and alert forecasters to locations where heavy precipitation is or has occurred. This is very important, for example, during thunderstorm events where forecasters need to assess flash flood potential as necessary. In the accompanying image, a 3-hour rainfall estimate on April 16, 1998 indicated bands of rainfall across central Kentucky and north-central Tennessee.  These bands show very well the path of thunderstorms. Estimated rainfall amounts in these bands were 0.25 to 0.75 of an inch, with the highest amounts up to 2.5 inches in 3 hours (light/yellow color in second band from the bottom of the image).

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